Is there any recommended books or websites to help?I've been reading a book from an American on music publishing but I believe they have different publishing rules and regs so I really wanted to find out more about UK's /Euro music publishing

MCPS is the organisation who collect money for the recording of published works (generally for commercial gain but there are other areas too). Important - it is the money for the recording of the work, not the recording itself. That is a different royalty.
PRS is the organisation who collect money for the performance of published works.

Who gets what:

The publisher tales the publishers share and distributes that part to the published members of a track (generally the writers!!)
The writer gets the writers share direct.

The above agencies collect the money at source and send half to the writer and half to the publisher.

So...

Sale of recording of published work ----> money (8.5% of the dealer price) -> MCPS -> publisher and writer

Performance of published work ----> money --> PRS -> publisher and writer

Publishing splits vary from 90/10 deals in favour of the writer all the way to 100% to the publisher for many libraries